Vertiv™ | Liebert® STS2/PDU
™
User Manual | Rev. 6 | 10/2017 73
Hardware
• The Liebert STS2/PDU operator interface in the Color Graphical Display unit is designed to provide all of the information
required to configure and monitor the unit’s operation.
• The control logic performs automatic operations with minimal operator interface.
• Each Liebert STS2/PDU unit is equipped with a color LCD touchscreen.
• The Liebert STS2/PDU can have optional communication ports installed. See 6.0 - Options and 12.0 - Communication
Interfaces for more information on communication options.
• The RS-232 interface is used for configuration and status and event log monitoring.
Firmware
The operator interface enables you to monitor the Liebert STS2/PDU, to configure setpoints for transfers,
monitor system parameters and access event and history logs. The firmware is accessible through the LCD
touchscreen or the RS-232 interface. The firmware includes:
• View and set the preferred source.
• View and configure setpoints.
• View alarms, faults and status.
• The mimic graphical representation of the systems operation.
• Menu driven monitoring and configuration.
• Step-by-step instructions to assist you in the startup, shutdown and bypass operations.
• Help on event messages.
• Touchscreen alarm reset and silence buttons.
Events in the system, both faults and alarms, are detected and displayed on the LCD. See 11.0 - Alarms and Faults for
more information on events.
• A set of event masks can be configured through the LCD to trigger a system response to an event. See 11.1 - Event Mask.
• Report event conditions from other components of the system.
• Monitor and report changes in event condition states. If the event condition’s state changes from inactive to active, a new
event is detected. If the transition is from active to inactive, the event condition has cleared.
• Process new faults and alarms and clear inactive alarms.
• Provide the alarm reset and silence options.
9.2.2 Circuit Breakers and Non-Automatic Circuit Breakers
Input circuit breaker for each source provides over current protection for the Liebert STS2/PDU. Three
non-automatic circuit breakers provide total isolation of the solid-state switching devices with an input
non-automatic breaker for each source and a load isolation non-automatic breaker. Two non-automatic breakers
provide for maintenance bypassing of the solid-state switching devices to either input source.
All breakers in the Liebert STS2/PDU are plug-in types, which allows any breaker to be replaced without
de-energizing the output bus. The breakers have an interlock in the plug-in base, which prevents the switch from
being withdrawn in the CLOSED position. The switch trips OPEN before it disconnects from the plug-in base.
See 14.2.5 - Circuit Breakers for specifications and more information pertaining to the circuit breakers. See
Figures 23 through 36 for circuit breaker locations.
The circuit breaker schedule is provided in Tables 10 through 12.
9.2.3 SCRs
Brick-type SCRs are used rated to carry the full 100% rated load. The unit is a fuseless design with input circuit
breakers providing overcurrent protection.
9.2.4 Logic Modules
The logic contains three separate redundant logic modules. The modules contain the logic necessary to run the
Liebert STS2/PDU and control transfers and shunt trips under all circumstances, without any outside assistance
once set-up and started properly.
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